Вправи: 4.17

4.17 Виконайте дії:

1) m3 + n4 – 1 = 4m+3n-1212;

2) 5 – 1c + 1d = 5cd-d+ccd;

3) a+35 – 1 + a-22 = 2a+3- 10+5(a-2)10 = 2a+6-10+5a-1010 = 7a-1410;

4) 1x-y + x + y = 1+x+y(x-y)x-y = 1+ x2- y2x-y.